I don't think he will reach his 2011 form again, at least not for such a long time.
Nole 1.5 is the best way to describe the current Nole. He is beatable, but still more aggressive than in the past. Great serving lately and Mental toughness keeps him as at least one of the two biggest favorites for every Slam.
Oh and viruzzz, don't even get me started on Berdych.
His 2012 is such a waste! He was playing good at AO, and found his best form at the start of the clay season, beating Murray from a set down, almost beating Djokovic and putting up a great performance against Nadal at some tourney. All this just to play a lousy match against Delpo, clearly missing his chances. (Can't say I'm not happy, though. Federer was next).
At Wimbledon he was unlucky to catch Gulbis on a fantastic day, but to blow up your second chance like that at the Olympics? I haven't seen such a nervous match from anybody since Federer-Haas RG 2009. Such a shame that he was playing his best Tennis but fucked up a year with so much potential.